(4x+1)(x-3)=9

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Solution for (4x+1)(x-3)=9 equation:


Simplifying
(4x + 1)(x + -3) = 9

Reorder the terms:
(1 + 4x)(x + -3) = 9

Reorder the terms:
(1 + 4x)(-3 + x) = 9

Multiply (1 + 4x) * (-3 + x)
(1(-3 + x) + 4x * (-3 + x)) = 9
((-3 * 1 + x * 1) + 4x * (-3 + x)) = 9
((-3 + 1x) + 4x * (-3 + x)) = 9
(-3 + 1x + (-3 * 4x + x * 4x)) = 9
(-3 + 1x + (-12x + 4x2)) = 9

Combine like terms: 1x + -12x = -11x
(-3 + -11x + 4x2) = 9

Solving
-3 + -11x + 4x2 = 9

Solving for variable 'x'.

Reorder the terms:
-3 + -9 + -11x + 4x2 = 9 + -9

Combine like terms: -3 + -9 = -12
-12 + -11x + 4x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-12 + -11x + 4x2 = 0

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
-3 + -2.75x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -2.75x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -2.75x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -2.75x + x2 = 0 + 3
-2.75x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-2.75x + x2 = 3

The x term is -2.75x.  Take half its coefficient (-1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
-2.75x + 1.890625 + x2 = 3 + 1.890625

Reorder the terms:
1.890625 + -2.75x + x2 = 3 + 1.890625

Combine like terms: 3 + 1.890625 = 4.890625
1.890625 + -2.75x + x2 = 4.890625

Factor a perfect square on the left side:
(x + -1.375)(x + -1.375) = 4.890625

Calculate the square root of the right side: 2.211475752

Break this problem into two subproblems by setting 
(x + -1.375) equal to 2.211475752 and -2.211475752.

Subproblem 1

x + -1.375 = 2.211475752 Simplifying x + -1.375 = 2.211475752 Reorder the terms: -1.375 + x = 2.211475752 Solving -1.375 + x = 2.211475752 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + x = 2.211475752 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = 2.211475752 + 1.375 x = 2.211475752 + 1.375 Combine like terms: 2.211475752 + 1.375 = 3.586475752 x = 3.586475752 Simplifying x = 3.586475752

Subproblem 2

x + -1.375 = -2.211475752 Simplifying x + -1.375 = -2.211475752 Reorder the terms: -1.375 + x = -2.211475752 Solving -1.375 + x = -2.211475752 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + x = -2.211475752 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = -2.211475752 + 1.375 x = -2.211475752 + 1.375 Combine like terms: -2.211475752 + 1.375 = -0.836475752 x = -0.836475752 Simplifying x = -0.836475752

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.586475752, -0.836475752}

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